помогите срочно розкрийте дужки -3(4+5m-6n) -0,2(-14t+x-25y) (3,1x+7,8y-9,3)*2 (7x-6y+0,5c)*(-3)

1. -3(4+5m-6n) = -12 - 15m + 18n

2. -0,2(-14t+x-25y) = 2,8t - 0,2x + 5y

3. (3,1x+7,8y-9,3)*2 = 6,2x + 15,6y - 18,6

4. (7x-6y+0,5c)*(-3) = -21x + 18y - 1,5c